Issue 10, 2012
From the journal:

Dalton Transactions

The effects of Mo doping on 0.3Li[Li0.33Mn0.67]O2·0.7Li[Ni0.5Co0.2Mn0.3]O2 cathode material

Jin-Hwan Park,†ab   Jinsub Lim,†c   Jaegu Yoon,a   Kyu-Sung Park,a   Jihyeon Gim,c   Jinju Song,c   Hyosun Park,c   Dongmin Im,a   Minsik Park,a   Docheon Ahn,d   Younkee Paike  and  Jaekook Kim*c  

* Corresponding authors

a Battery Group, Samsung Advanced Institute of Technology (SAIT), Yongin 446-712, Korea

b Department of Materials Science and Engineering, Seoul National University, Seoul 151-742, Korea

c Department of Materials Science and Engineering, Chonnam National University (WCU), Gwangju 500-757, Korea
E-mail: jaekook@chonnam.ac.kr
Fax: +82-62-530-1699
Tel: +82-62-530-1703

d Pohang Accelerator Laboratory, Pohang 790-784, Korea

e Daegu Center, Korea Basic Science Institute, Daegu 702-701, Korea

Abstract

Mo doped Li excess transition metal oxides formulated as 0.3Li[Li0.33Mn0.67]O2·0.7Li[Ni0.5-xCo0.2Mn0.3-xMo2x]O2 were synthesized using the co-precipitation process. The effects of the substitution of Ni and Mn with Mo were investigated for the density of the states, the structure, cycling stability, rate performance and thermal stability by tools such as first principle calculations, synchrotron X-ray diffraction, field-emission SEM, solid state 7Li MAS nuclear magnetic resonance (NMR), X-ray photoelectron spectroscopy (XPS), elemental mapping by scanning TEM (STEM), inductively coupled plasma atomic emission spectrometry (ICP-AES) and a differential scanning calorimeter (DSC). It was confirmed that high valence Mo6+ doping of the Li-excess manganese-nickel-cobalt layered oxide in the transition metal enhanced the structural stability and electrochemical performance. This increase was due to strong Mo–O hybridization inducing weak Ni–O hybridization, which may reduce O2 evolution, and metallic behavior resulting in a diminishing cell resistance.

Graphical abstract: The effects of Mo doping on 0.3Li[Li0.33Mn0.67]O2·0.7Li[Ni0.5Co0.2Mn0.3]O2 cathode material

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Article information

DOI
https://doi.org/10.1039/C2DT11833E
Article type
Paper
Submitted
27 Sep 2011
Accepted
09 Dec 2011
First published
26 Jan 2012

Dalton Trans., 2012,41, 3053-3059

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The effects of Mo doping on 0.3Li[Li0.33Mn0.67]O2·0.7Li[Ni0.5Co0.2Mn0.3]O2 cathode material

J. Park, J. Lim, J. Yoon, K. Park, J. Gim, J. Song, H. Park, D. Im, M. Park, D. Ahn, Y. Paik and J. Kim, Dalton Trans., 2012, 41, 3053 DOI: 10.1039/C2DT11833E

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